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As for sunlight, Virginia is about average in state rankings. [30] Areas on the Chesapeake Coast and Eastern Shore are brightest, while the west and north of the state is more cloudy. On the Winter Solstice, Virginia gets between 9 and 10 hours of sunlight. On the summer solstice, it gets between 14.5 and 15 hours.
While heat and humidity may be a common consequence to the summer season, the right factors can be deadly. An average of 658 people died of heat-related causes between 1999 and 2009. Check out the ...
For humidity ratios above 0.012 kg H 2 O/kg dry air (0.012 lb H 2 O/lb dry air), or for metabolic rates up to 2.0 met, the analytical model must be used to determine thermal comfort sensation. Also based on the PMV model, this method uses tools such as the ASHRAE Thermal Comfort Tool or the online CBE Thermal Comfort Tool for ASHRAE 55 [ 2 ] to ...
The recommended level of indoor humidity is in the range of 30–60% in air conditioned buildings, [34] [35] but new standards such as the adaptive model allow lower and higher humidity, depending on the other factors involved in thermal comfort.
The representation is made on a temperature-relative humidity, instead of a standard psychrometric chart. The comfort zone in blue represents the 90% of acceptability, which means the conditions between -0.5 and +0.5 PMV, or PPD < 10%.
As wet weather returns to the Ohio Valley and interior Northeast around midweek, storms that push into the region will be capable of packing downpours, hail, locally damaging winds and even ...
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By comparison, thermal comfort standard ASHRAE 55 requires systems designed to control humidity to maintain a dew point of 16.8 °C (62.2 °F) though no lower humidity limit is established. [ 44 ] Water vapor is a lighter gas than other gaseous components of air at the same temperature, so humid air will tend to rise by natural convection .